Chen W.-JTsou Y.-JShih H.-CLiu P.-CCHEE-WEE LIU2022-04-252022-04-252021https://www.scopus.com/inward/record.uri?eid=2-s2.0-85119408638&doi=10.1109%2fSISPAD54002.2021.9592529&partnerID=40&md5=2f6fa725489ad98f9b0a55e940be766bhttps://scholars.lib.ntu.edu.tw/handle/123456789/606969Field-free switching of perpendicular spin-orbit torque magnetic tunnel junction (p-SOT-MTJ) is investigated using micromagnetic simulation to evaluate the SOT critical current density (JC,SOT). The spin-transfer torque (STT) can break the symmetry and ensure the deterministic switching of p-SOTMTJ without the external magnetic field. The decreasing SOT pulse width (tSOT) below 1 ns causes the significant increase of JC,SOT. The increasing STT current density (JSTT) can overcome the damping torque and reduce the JC,SOT. For a short tSOT of 0.2 ns, the increase of STT current density (JSTT) from 0.64 MA/cm2 to 0.97 MA/cm2(VSTT from 0.2 V to 0.3 V) reduces the JC,SOT by 36%. As the spin Hall angle (θSH) of SOT channels increases from 0.28 to 0.5, the JC,SOT can further be reduced by 46%. ? 2021 IEEE.critical currentfield-free switchingmicromagnetic simulationMTJSOT-MRAMCurrent densityMagnetic logic devicesMRAM devicesTunnel junctionsCurrent reductionField-free switchingMagnetic tunnel junctionMicromagnetic simulationsSpin orbitsSpin transfer torqueTorque assistsTorque currentMagnetic recordingconference paper10.1109/SISPAD54002.2021.95925292-s2.0-85119408638